Method of surfacing stone



March-31, 1931. H. H.ALTHOFF METHOD OF SURFACING STONE Filed May 9, 1930 WITNESSES Qnr BY ATTORNEYS Patented M... 31, 1931 HENRY H. ALTHOFF, on NEW YORK, N. Y.

METHOD OF SUB/FACING STONE Application filed May 9, 1930. Serial No. 451,090.

This invention relates to a method of surfacing stone, and an ob ect of the lnvention is to give to a block of granite or other suitable stone a pitted undulating surface, which gives the appearance of age to the stone.

The invention consists in certain novel steps in the method, all of which will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings Figure 1 is a view in elevation, showing a block of granite having scallops therein, which constitutes the first step in my improved method.

Figure 2 is a View in section through the stone, shown in Figure 1.

Figure 3 is a view similar to Figure 2, illustrating the second step of my improved method, which consists in removing the sharp edges of the scalloped stone to give a rounded, undulating appearance thereto, and also illustrating the provision of grooves in the stone which may be formed by any suitable tool.

Figure 4 is a view in elevation, similar to Figure 1, showing the finished stone having the last step of my improved method applied thereto, which consists in directing a sandblast against the surface of the stone to provide a pitted surface and roughened edges of the grooves to give to the stone the appearance of age, and the simulation of cracks or seams in the stone.

In carrying out my invention, I utilize a block of rough quarried stone A, such, for example, as granite. I next form irregular recesses l in the surface, of the stone. this formation being known in the trade as scal loping. This scalloping leaves sharp edges 2 around the recesses or sinkages, and the next step of the process is to round or par tially smooth the sharp edges, as indicated at 3 in Figure 3, constituting thewalls of the recesses. This operation may be carried out by the employment of a sharp pointed or edged tool.

The first step of forming recesses or scallops is illustrated by Figures 1 and 2 of the drawings, and Figure 3 illustrates the next step in the formation of'the stone, with the edges or walls of the scallops rounded or smooth. vVith the stone in this condition I may form grooves 4 in the stone, which will later give the appearance of cracks or seams in the stone.

The last step of the method is to direct a sandblast to the surface of the stone. This sandblasting results in providing a pitted surface, and further rounds or smooths the scalloped edges and roughens the walls of the grooves to perfectly simulate cracks or seams in the stone. V

This final step of the process, that is, utilizing the sandblast on the stone after it has been previouslytreated as above explained, gives an appearance of age to the stone, and the stone may be given a surface coloring, either dark or light, in accordance with the particular abrasivematerial employed.

The term sandblasting is used in'the trade to include the blowing by blast apparatus of any granular or analogous material, and while sand may be used it is also possible to use other granular material in accordance with the surfacing desired.

What I claim is:

1. The herein described method of surfacing stone, comprising, first, scalloping the surface of the stone, next, smoothing or rounding the sharp edges of the scallops of the stone, and then sandblasting the surface of the stone.

2. The herein described method of surfacing stone, comprising scalloping the surface of the stone, then by a pointed tool rounding or smoothing the edges of the walls of the scallops of the stone, then cutting grooves in the surface of the stone, and then sandblasting the surface of the stone.

. HENRY H. ALTHOFF. 

